/* xbt_os_thread -- portability layer over the pthread API */
/* Used in RL to get win/lin portability, and in SG when CONTEXT_THREAD */
-/* in SG, when using CONTEXT_UCONTEXT, xbt_os_thread_stub is used instead */
+/* in SG, when using HAVE_UCONTEXT_CONTEXTS, xbt_os_thread_stub is used instead */
-/* Copyright (c) 2007, 2008, 2009, 2010. The SimGrid Team.
+/* Copyright (c) 2007-2015. The SimGrid Team.
* All rights reserved. */
/* This program is free software; you can redistribute it and/or modify it
* under the terms of the license (GNU LGPL) which comes with this package. */
-#include "internal_config.h"
-#include "xbt/sysdep.h"
-#include "xbt/ex.h"
-#include "xbt/ex_interface.h" /* We play crude games with exceptions */
-#include "portable.h"
-#include "xbt/xbt_os_time.h" /* Portable time facilities */
-#include "xbt/xbt_os_thread.h" /* This module */
-#include "xbt_modinter.h" /* Initialization/finalization of this module */
+#include "src/internal_config.h"
+#if HAVE_PTHREAD_SETAFFINITY
+#define _GNU_SOURCE
+#include <sched.h>
+#endif
-XBT_LOG_NEW_DEFAULT_SUBCATEGORY(xbt_sync_os, xbt,
- "Synchronization mechanism (OS-level)");
+#include <pthread.h>
-/* ********************************* PTHREAD IMPLEMENTATION ************************************ */
-#ifdef HAVE_PTHREAD_H
+#if defined(__FreeBSD__)
+#include "pthread_np.h"
+#define cpu_set_t cpuset_t
+#endif
+#include <limits.h>
#include <semaphore.h>
-
-#ifdef HAVE_MUTEX_TIMEDLOCK
-/* redefine the function header since we fail to get this from system headers on amd (at least) */
-int pthread_mutex_timedlock(pthread_mutex_t * mutex,
- const struct timespec *abs_timeout);
+#include <errno.h>
+
+#if defined(_WIN32)
+#include <windows.h>
+#elif defined(__MACH__) && defined(__APPLE__)
+#include <stdint.h>
+#include <sys/types.h>
+#include <sys/sysctl.h>
+#else
+#include <unistd.h>
#endif
+#include "xbt/sysdep.h"
+#include "xbt/ex.h"
+#include "src/internal_config.h"
+#include "xbt/xbt_os_time.h" /* Portable time facilities */
+#include "xbt/xbt_os_thread.h" /* This module */
+#include "src/xbt_modinter.h" /* Initialization/finalization of this module */
+
+XBT_LOG_NEW_DEFAULT_SUBCATEGORY(xbt_sync_os, xbt, "Synchronization mechanism (OS-level)");
-/* use named sempahore when sem_init() does not work */
-#ifndef HAVE_SEM_INIT
+/* use named semaphore when sem_init() does not work */
+#if !HAVE_SEM_INIT
static int next_sem_ID = 0;
static xbt_os_mutex_t next_sem_ID_lock;
#endif
char *name;
void *param;
pvoid_f_pvoid_t start_routine;
- xbt_running_ctx_t *running_ctx;
void *extra_data;
} s_xbt_os_thread_t;
static xbt_os_thread_t main_thread = NULL;
static pthread_key_t xbt_self_thread_key;
static int thread_mod_inited = 0;
-/* attribute structure to handle pthread stack size changing */
+/* defaults attribute for pthreads */
//FIXME: find where to put this
-static pthread_attr_t attr;
-static int thread_attr_inited = 0;
+static pthread_attr_t thread_attr;
/* frees the xbt_os_thread_t corresponding to the current thread */
static void xbt_os_thread_free_thread_data(xbt_os_thread_t thread)
{
if (thread == main_thread) /* just killed main thread */
main_thread = NULL;
-
- free(thread->running_ctx);
free(thread->name);
free(thread);
}
-/* callback: context fetching */
-static xbt_running_ctx_t *_os_thread_get_running_ctx(void)
-{
- return xbt_os_thread_self()->running_ctx;
-}
-
/* callback: termination */
static void _os_thread_ex_terminate(xbt_ex_t * e)
{
void xbt_os_thread_mod_preinit(void)
{
- int errcode;
-
if (thread_mod_inited)
return;
- if ((errcode = pthread_key_create(&xbt_self_thread_key, NULL)))
- THROWF(system_error, errcode,
- "pthread_key_create failed for xbt_self_thread_key");
+ int errcode = pthread_key_create(&xbt_self_thread_key, NULL);
+ xbt_assert(errcode == 0, "pthread_key_create failed for xbt_self_thread_key");
main_thread = xbt_new(s_xbt_os_thread_t, 1);
- main_thread->name = (char *) "main";
- main_thread->start_routine = NULL;
+ main_thread->name = NULL;
+ main_thread->detached = 0;
+ main_thread->name = xbt_strdup("main");
main_thread->param = NULL;
- main_thread->running_ctx = xbt_new(xbt_running_ctx_t, 1);
- XBT_RUNNING_CTX_INITIALIZE(main_thread->running_ctx);
+ main_thread->start_routine = NULL;
+ main_thread->extra_data = NULL;
if ((errcode = pthread_setspecific(xbt_self_thread_key, main_thread)))
THROWF(system_error, errcode,
- "pthread_setspecific failed for xbt_self_thread_key");
+ "Impossible to set the SimGrid identity descriptor to the main thread (pthread_setspecific failed)");
-
- __xbt_running_ctx_fetch = _os_thread_get_running_ctx;
- __xbt_ex_terminate = _os_thread_ex_terminate;
+ pthread_attr_init(&thread_attr);
thread_mod_inited = 1;
-#ifndef HAVE_SEM_INIT
+#if !HAVE_SEM_INIT
next_sem_ID_lock = xbt_os_mutex_init();
#endif
-
}
void xbt_os_thread_mod_postexit(void)
// if ((errcode=pthread_key_delete(xbt_self_thread_key)))
// THROWF(system_error,errcode,"pthread_key_delete failed for xbt_self_thread_key");
- free(main_thread->running_ctx);
+ free(main_thread->name);
free(main_thread);
main_thread = NULL;
thread_mod_inited = 0;
-#ifndef HAVE_SEM_INIT
+#if !HAVE_SEM_INIT
xbt_os_mutex_destroy(next_sem_ID_lock);
#endif
-
- /* Restore the default exception setup */
- __xbt_running_ctx_fetch = &__xbt_ex_ctx_default;
- __xbt_ex_terminate = &__xbt_ex_terminate_default;
}
+/** Calls pthread_atfork() if present, and raise an exception otherwise.
+ *
+ * The only known user of this wrapper is mmalloc_preinit(), but it is absolutely mandatory there:
+ * when used with tesh, mmalloc *must* be mutex protected and resistant to forks.
+ * This functionality is the only way to get it working (by ensuring that the mutex is consistently released on forks)
+ */
+
/* this function is critical to tesh+mmalloc, don't mess with it */
-int xbt_os_thread_atfork(void (*prepare)(void),
- void (*parent)(void), void (*child)(void))
+int xbt_os_thread_atfork(void (*prepare)(void), void (*parent)(void), void (*child)(void))
{
-#ifdef WIN32
- THROW_UNIMPLEMENTED; //pthread_atfork is not implemented in pthread.h on windows
-#else
return pthread_atfork(prepare, parent, child);
-#endif
}
static void *wrapper_start_routine(void *s)
{
xbt_os_thread_t t = s;
- int errcode;
- if ((errcode = pthread_setspecific(xbt_self_thread_key, t)))
- THROWF(system_error, errcode,
- "pthread_setspecific failed for xbt_self_thread_key");
+ int errcode = pthread_setspecific(xbt_self_thread_key, t);
+ xbt_assert(errcode == 0, "pthread_setspecific failed for xbt_self_thread_key");
void *res = t->start_routine(t->param);
if (t->detached)
return res;
}
-
-xbt_os_thread_t xbt_os_thread_create(const char *name,
- pvoid_f_pvoid_t start_routine,
- void *param,
- void *extra_data)
+xbt_os_thread_t xbt_os_thread_create(const char *name, pvoid_f_pvoid_t start_routine, void *param, void *extra_data)
{
- int errcode;
-
xbt_os_thread_t res_thread = xbt_new(s_xbt_os_thread_t, 1);
res_thread->detached = 0;
res_thread->name = xbt_strdup(name);
res_thread->start_routine = start_routine;
res_thread->param = param;
- res_thread->running_ctx = xbt_new(xbt_running_ctx_t, 1);
- XBT_RUNNING_CTX_INITIALIZE(res_thread->running_ctx);
res_thread->extra_data = extra_data;
- if ((errcode = pthread_create(&(res_thread->t), thread_attr_inited!=0? &attr: NULL,
- wrapper_start_routine, res_thread)))
- THROWF(system_error, errcode,
- "pthread_create failed: %s", strerror(errcode));
-
-
+ int errcode = pthread_create(&(res_thread->t), &thread_attr, wrapper_start_routine, res_thread);
+ xbt_assert(errcode == 0, "pthread_create failed: %s", strerror(errcode));
return res_thread;
}
+/** Bind the thread to the given core, if possible.
+ *
+ * If pthread_setaffinity_np is not usable on that (non-gnu) platform, this function does nothing.
+ */
+int xbt_os_thread_bind(xbt_os_thread_t thread, int cpu){
+ int errcode = 0;
+#if HAVE_PTHREAD_SETAFFINITY
+ pthread_t pthread = thread->t;
+ cpu_set_t cpuset;
+ CPU_ZERO(&cpuset);
+ CPU_SET(cpu, &cpuset);
+ errcode = pthread_setaffinity_np(pthread, sizeof(cpu_set_t), &cpuset);
+#endif
+ return errcode;
+}
void xbt_os_thread_setstacksize(int stack_size)
{
- size_t def=0;
- if(stack_size<0)xbt_die("stack size is negative, maybe it exceeds MAX_INT?\n");
- pthread_attr_init(&attr);
- pthread_attr_getstacksize (&attr, &def);
- int res = pthread_attr_setstacksize (&attr, stack_size);
- if ( res!=0 ) {
- if(res==EINVAL)XBT_WARN("Thread stack size is either < PTHREAD_STACK_MIN, > the max limit of the system, or perhaps not a multiple of PTHREAD_STACK_MIN - The parameter was ignored");
- else XBT_WARN("unknown error in pthread stacksize setting");
-
- pthread_attr_setstacksize (&attr, def);
+ size_t alignment[] = {
+ xbt_pagesize,
+#ifdef PTHREAD_STACK_MIN
+ PTHREAD_STACK_MIN,
+#endif
+ 0
+ };
+
+ xbt_assert(stack_size >= 0, "stack size %d is negative, maybe it exceeds MAX_INT?", stack_size);
+
+ size_t sz = stack_size;
+ int res = pthread_attr_setstacksize(&thread_attr, sz);
+
+ for (int i = 0; res == EINVAL && alignment[i] > 0; i++) {
+ /* Invalid size, try again with next multiple of alignment[i]. */
+ size_t rem = sz % alignment[i];
+ if (rem != 0 || sz == 0) {
+ size_t sz2 = sz - rem + alignment[i];
+ XBT_DEBUG("pthread_attr_setstacksize failed for %zd, try again with %zd", sz, sz2);
+ sz = sz2;
+ res = pthread_attr_setstacksize(&thread_attr, sz);
+ }
}
- thread_attr_inited=1;
+
+ if (res == EINVAL)
+ XBT_WARN("invalid stack size (maybe too big): %zd", sz);
+ else if (res != 0)
+ XBT_WARN("unknown error %d in pthread stacksize setting: %zd", res, sz);
}
-const char *xbt_os_thread_name(xbt_os_thread_t t)
+void xbt_os_thread_setguardsize(int guard_size)
{
- return t->name;
+#ifdef WIN32
+ THROW_UNIMPLEMENTED; //pthread_attr_setguardsize is not implemented in pthread.h on windows
+#else
+ size_t sz = guard_size;
+ int res = pthread_attr_setguardsize(&thread_attr, sz);
+ if (res)
+ XBT_WARN("pthread_attr_setguardsize failed (%d) for size: %zd", res, sz);
+#endif
}
const char *xbt_os_thread_self_name(void)
{
xbt_os_thread_t me = xbt_os_thread_self();
- return me ? me->name : "main";
+ return me ? (const char *)me->name : "main";
}
void xbt_os_thread_join(xbt_os_thread_t thread, void **thread_return)
{
+ int errcode = pthread_join(thread->t, thread_return);
- int errcode;
-
- if ((errcode = pthread_join(thread->t, thread_return)))
- THROWF(system_error, errcode, "pthread_join failed: %s",
- strerror(errcode));
+ xbt_assert(errcode==0, "pthread_join failed: %s", strerror(errcode));
xbt_os_thread_free_thread_data(thread);
}
pthread_exit(retval);
}
-xbt_os_thread_t xbt_os_thread_self(void)
+xbt_os_thread_t xbt_os_thread_self(void )
{
- xbt_os_thread_t res;
-
if (!thread_mod_inited)
return NULL;
- res = pthread_getspecific(xbt_self_thread_key);
-
- return res;
+ return pthread_getspecific(xbt_self_thread_key);
}
-void xbt_os_thread_key_create(xbt_os_thread_key_t* key) {
-
- int errcode;
- if ((errcode = pthread_key_create(key, NULL)))
- THROWF(system_error, errcode, "pthread_key_create failed");
+void xbt_os_thread_key_create(xbt_os_thread_key_t* key)
+{
+ int errcode = pthread_key_create(key, NULL);
+ xbt_assert(errcode==0 , "pthread_key_create failed");
}
-void xbt_os_thread_set_specific(xbt_os_thread_key_t key, void* value) {
-
- int errcode;
- if ((errcode = pthread_setspecific(key, value)))
- THROWF(system_error, errcode, "pthread_setspecific failed");
+void xbt_os_thread_set_specific(xbt_os_thread_key_t key, void* value)
+{
+ int errcode = pthread_setspecific(key, value);
+ xbt_assert(errcode==0, "pthread_setspecific failed");
}
-void* xbt_os_thread_get_specific(xbt_os_thread_key_t key) {
+void* xbt_os_thread_get_specific(xbt_os_thread_key_t key)
+{
return pthread_getspecific(key);
}
/****** mutex related functions ******/
typedef struct xbt_os_mutex_ {
- /* KEEP IT IN SYNC WITH xbt_thread.c */
pthread_mutex_t m;
} s_xbt_os_mutex_t;
xbt_os_mutex_t xbt_os_mutex_init(void)
{
- xbt_os_mutex_t res = xbt_new(s_xbt_os_mutex_t, 1);
- int errcode;
+ pthread_mutexattr_t Attr;
+ pthread_mutexattr_init(&Attr);
+ pthread_mutexattr_settype(&Attr, PTHREAD_MUTEX_RECURSIVE);
- if ((errcode = pthread_mutex_init(&(res->m), NULL)))
- THROWF(system_error, errcode, "pthread_mutex_init() failed: %s",
- strerror(errcode));
+ xbt_os_mutex_t res = xbt_new(s_xbt_os_mutex_t, 1);
+ int errcode = pthread_mutex_init(&(res->m), &Attr);
+ xbt_assert(errcode==0, "pthread_mutex_init() failed: %s", strerror(errcode));
return res;
}
void xbt_os_mutex_acquire(xbt_os_mutex_t mutex)
{
- int errcode;
-
- if ((errcode = pthread_mutex_lock(&(mutex->m))))
- THROWF(system_error, errcode, "pthread_mutex_lock(%p) failed: %s",
- mutex, strerror(errcode));
-}
-
-
-void xbt_os_mutex_timedacquire(xbt_os_mutex_t mutex, double delay)
-{
- int errcode;
-
- if (delay < 0) {
- xbt_os_mutex_acquire(mutex);
-
- } else if (delay == 0) {
- errcode = pthread_mutex_trylock(&(mutex->m));
-
- switch (errcode) {
- case 0:
- return;
- case ETIMEDOUT:
- THROWF(timeout_error, 0, "mutex %p not ready", mutex);
- default:
- THROWF(system_error, errcode,
- "xbt_mutex_timedacquire(%p) failed: %s", mutex,
- strerror(errcode));
- }
-
-
- } else {
-
-#ifdef HAVE_MUTEX_TIMEDLOCK
- struct timespec ts_end;
- double end = delay + xbt_os_time();
-
- ts_end.tv_sec = (time_t) floor(end);
- ts_end.tv_nsec = (long) ((end - ts_end.tv_sec) * 1000000000);
- XBT_DEBUG("pthread_mutex_timedlock(%p,%p)", &(mutex->m), &ts_end);
-
- errcode = pthread_mutex_timedlock(&(mutex->m), &ts_end);
-
-#else /* Well, let's reimplement it since those lazy libc dudes didn't */
- double start = xbt_os_time();
- do {
- errcode = pthread_mutex_trylock(&(mutex->m));
- if (errcode == EBUSY)
- xbt_os_thread_yield();
- } while (errcode == EBUSY && xbt_os_time() - start < delay);
-
- if (errcode == EBUSY)
- errcode = ETIMEDOUT;
-
-#endif /* HAVE_MUTEX_TIMEDLOCK */
-
- switch (errcode) {
- case 0:
- return;
-
- case ETIMEDOUT:
- THROWF(timeout_error, delay,
- "mutex %p wasn't signaled before timeout (%f)", mutex, delay);
-
- default:
- THROWF(system_error, errcode,
- "pthread_mutex_timedlock(%p,%f) failed: %s", mutex, delay,
- strerror(errcode));
- }
- }
+ int errcode = pthread_mutex_lock(&(mutex->m));
+ xbt_assert(errcode==0, "pthread_mutex_lock(%p) failed: %s", mutex, strerror(errcode));
}
void xbt_os_mutex_release(xbt_os_mutex_t mutex)
{
- int errcode;
-
- if ((errcode = pthread_mutex_unlock(&(mutex->m))))
- THROWF(system_error, errcode, "pthread_mutex_unlock(%p) failed: %s",
- mutex, strerror(errcode));
+ int errcode = pthread_mutex_unlock(&(mutex->m));
+ xbt_assert(errcode==0, "pthread_mutex_unlock(%p) failed: %s", mutex, strerror(errcode));
}
void xbt_os_mutex_destroy(xbt_os_mutex_t mutex)
{
- int errcode;
-
if (!mutex)
return;
- if ((errcode = pthread_mutex_destroy(&(mutex->m))))
- THROWF(system_error, errcode, "pthread_mutex_destroy(%p) failed: %s",
- mutex, strerror(errcode));
+ int errcode = pthread_mutex_destroy(&(mutex->m));
+ xbt_assert(errcode == 0, "pthread_mutex_destroy(%p) failed: %s", mutex, strerror(errcode));
free(mutex);
}
/***** condition related functions *****/
typedef struct xbt_os_cond_ {
- /* KEEP IT IN SYNC WITH xbt_thread.c */
pthread_cond_t c;
} s_xbt_os_cond_t;
xbt_os_cond_t xbt_os_cond_init(void)
{
xbt_os_cond_t res = xbt_new(s_xbt_os_cond_t, 1);
- int errcode;
- if ((errcode = pthread_cond_init(&(res->c), NULL)))
- THROWF(system_error, errcode, "pthread_cond_init() failed: %s",
- strerror(errcode));
-
+ int errcode = pthread_cond_init(&(res->c), NULL);
+ xbt_assert(errcode==0, "pthread_cond_init() failed: %s", strerror(errcode));
return res;
}
void xbt_os_cond_wait(xbt_os_cond_t cond, xbt_os_mutex_t mutex)
{
- int errcode;
- if ((errcode = pthread_cond_wait(&(cond->c), &(mutex->m))))
- THROWF(system_error, errcode, "pthread_cond_wait(%p,%p) failed: %s",
- cond, mutex, strerror(errcode));
-}
-
-
-void xbt_os_cond_timedwait(xbt_os_cond_t cond, xbt_os_mutex_t mutex,
- double delay)
-{
- int errcode;
- struct timespec ts_end;
- double end = delay + xbt_os_time();
-
- if (delay < 0) {
- xbt_os_cond_wait(cond, mutex);
- } else {
- ts_end.tv_sec = (time_t) floor(end);
- ts_end.tv_nsec = (long) ((end - ts_end.tv_sec) * 1000000000);
- XBT_DEBUG("pthread_cond_timedwait(%p,%p,%p)", &(cond->c), &(mutex->m),
- &ts_end);
- switch ((errcode =
- pthread_cond_timedwait(&(cond->c), &(mutex->m), &ts_end))) {
- case 0:
- return;
- case ETIMEDOUT:
- THROWF(timeout_error, errcode,
- "condition %p (mutex %p) wasn't signaled before timeout (%f)",
- cond, mutex, delay);
- default:
- THROWF(system_error, errcode,
- "pthread_cond_timedwait(%p,%p,%f) failed: %s", cond, mutex,
- delay, strerror(errcode));
- }
- }
+ int errcode = pthread_cond_wait(&(cond->c), &(mutex->m));
+ xbt_assert(errcode==0, "pthread_cond_wait(%p,%p) failed: %s", cond, mutex, strerror(errcode));
}
void xbt_os_cond_signal(xbt_os_cond_t cond)
{
- int errcode;
- if ((errcode = pthread_cond_signal(&(cond->c))))
- THROWF(system_error, errcode, "pthread_cond_signal(%p) failed: %s",
- cond, strerror(errcode));
+ int errcode = pthread_cond_signal(&(cond->c));
+ xbt_assert(errcode==0, "pthread_cond_signal(%p) failed: %s", cond, strerror(errcode));
}
void xbt_os_cond_broadcast(xbt_os_cond_t cond)
{
- int errcode;
- if ((errcode = pthread_cond_broadcast(&(cond->c))))
- THROWF(system_error, errcode, "pthread_cond_broadcast(%p) failed: %s",
- cond, strerror(errcode));
+ int errcode = pthread_cond_broadcast(&(cond->c));
+ xbt_assert(errcode==0, "pthread_cond_broadcast(%p) failed: %s", cond, strerror(errcode));
}
void xbt_os_cond_destroy(xbt_os_cond_t cond)
{
- int errcode;
-
if (!cond)
return;
- if ((errcode = pthread_cond_destroy(&(cond->c))))
- THROWF(system_error, errcode, "pthread_cond_destroy(%p) failed: %s",
- cond, strerror(errcode));
+ int errcode = pthread_cond_destroy(&(cond->c));
+ xbt_assert(errcode==0, "pthread_cond_destroy(%p) failed: %s", cond, strerror(errcode));
free(cond);
}
-void *xbt_os_thread_getparam(void)
-{
- xbt_os_thread_t t = xbt_os_thread_self();
- return t ? t->param : NULL;
-}
-
typedef struct xbt_os_sem_ {
-#ifndef HAVE_SEM_INIT
+#if !HAVE_SEM_INIT
char *name;
#endif
sem_t s;
* Any attempt to use it leads to ENOSYS (function not implemented).
* If such a prehistoric system is detected, do the job with sem_open instead
*/
-#ifdef HAVE_SEM_INIT
+#if HAVE_SEM_INIT
if (sem_init(&(res->s), 0, value) != 0)
THROWF(system_error, errno, "sem_init() failed: %s", strerror(errno));
res->ps = &(res->s);
#else /* damn, no sem_init(). Reimplement it */
xbt_os_mutex_acquire(next_sem_ID_lock);
- res->name = bprintf("/%d", ++next_sem_ID);
+ res->name = bprintf("/sg-%d", ++next_sem_ID);
xbt_os_mutex_release(next_sem_ID_lock);
+ sem_unlink(res->name);
res->ps = sem_open(res->name, O_CREAT, 0644, value);
if ((res->ps == (sem_t *) SEM_FAILED) && (errno == ENAMETOOLONG)) {
/* Old darwins only allow 13 chars. Did you create *that* amount of semaphores? */
res->name[13] = '\0';
+ sem_unlink(res->name);
res->ps = sem_open(res->name, O_CREAT, 0644, value);
}
- if ((res->ps == (sem_t *) SEM_FAILED))
+ if (res->ps == (sem_t *) SEM_FAILED)
THROWF(system_error, errno, "sem_open() failed: %s", strerror(errno));
/* Remove the name from the semaphore namespace: we never join on it */
void xbt_os_sem_acquire(xbt_os_sem_t sem)
{
- if (!sem)
- THROWF(arg_error, EINVAL, "Cannot acquire of the NULL semaphore");
if (sem_wait(sem->ps) < 0)
THROWF(system_error, errno, "sem_wait() failed: %s", strerror(errno));
}
-void xbt_os_sem_timedacquire(xbt_os_sem_t sem, double delay)
-{
- int errcode;
-
- if (!sem)
- THROWF(arg_error, EINVAL, "Cannot acquire of the NULL semaphore");
-
- if (delay < 0) {
- xbt_os_sem_acquire(sem);
- } else if (delay == 0) {
- errcode = sem_trywait(sem->ps);
-
- switch (errcode) {
- case 0:
- return;
- case ETIMEDOUT:
- THROWF(timeout_error, 0, "semaphore %p not ready", sem);
- default:
- THROWF(system_error, errcode,
- "xbt_os_sem_timedacquire(%p) failed: %s", sem,
- strerror(errcode));
- }
-
- } else {
-#ifdef HAVE_SEM_WAIT
- struct timespec ts_end;
- double end = delay + xbt_os_time();
-
- ts_end.tv_sec = (time_t) floor(end);
- ts_end.tv_nsec = (long) ((end - ts_end.tv_sec) * 1000000000);
- XBT_DEBUG("sem_timedwait(%p,%p)", sem->ps, &ts_end);
- errcode = sem_timedwait(sem->s, &ts_end);
-
-#else /* Okay, reimplement this function then */
- double start = xbt_os_time();
- do {
- errcode = sem_trywait(sem->ps);
- if (errcode == EBUSY)
- xbt_os_thread_yield();
- } while (errcode == EBUSY && xbt_os_time() - start < delay);
-
- if (errcode == EBUSY)
- errcode = ETIMEDOUT;
-#endif
-
- switch (errcode) {
- case 0:
- return;
-
- case ETIMEDOUT:
- THROWF(timeout_error, delay,
- "semaphore %p wasn't signaled before timeout (%f)", sem,
- delay);
-
- default:
- THROWF(system_error, errcode, "sem_timedwait(%p,%f) failed: %s", sem,
- delay, strerror(errcode));
- }
- }
-}
-
void xbt_os_sem_release(xbt_os_sem_t sem)
{
- if (!sem)
- THROWF(arg_error, EINVAL, "Cannot release of the NULL semaphore");
-
if (sem_post(sem->ps) < 0)
THROWF(system_error, errno, "sem_post() failed: %s", strerror(errno));
}
void xbt_os_sem_destroy(xbt_os_sem_t sem)
{
- if (!sem)
- THROWF(arg_error, EINVAL, "Cannot destroy the NULL sempahore");
-
-#ifdef HAVE_SEM_INIT
+#if HAVE_SEM_INIT
if (sem_destroy(sem->ps) < 0)
- THROWF(system_error, errno, "sem_destroy() failed: %s",
- strerror(errno));
+ THROWF(system_error, errno, "sem_destroy() failed: %s", strerror(errno));
#else
if (sem_close(sem->ps) < 0)
THROWF(system_error, errno, "sem_close() failed: %s", strerror(errno));
xbt_free(sem->name);
-
-#endif
- xbt_free(sem);
-}
-
-void xbt_os_sem_get_value(xbt_os_sem_t sem, int *svalue)
-{
- if (!sem)
- THROWF(arg_error, EINVAL,
- "Cannot get the value of the NULL semaphore");
-
- if (sem_getvalue(&(sem->s), svalue) < 0)
- THROWF(system_error, errno, "sem_getvalue() failed: %s",
- strerror(errno));
-}
-
-/* ********************************* WINDOWS IMPLEMENTATION ************************************ */
-
-#elif defined(_XBT_WIN32)
-
-#include <math.h>
-
-typedef struct xbt_os_thread_ {
- char *name;
- HANDLE handle; /* the win thread handle */
- unsigned long id; /* the win thread id */
- pvoid_f_pvoid_t start_routine;
- void *param;
- void *extra_data;
-} s_xbt_os_thread_t;
-
-/* so we can specify the size of the stack of the threads */
-#ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
-#define STACK_SIZE_PARAM_IS_A_RESERVATION 0x00010000
-#endif
-
-/* the default size of the stack of the threads (in bytes)*/
-#define XBT_DEFAULT_THREAD_STACK_SIZE 4096
-static int stack_size=0;
-/* key to the TLS containing the xbt_os_thread_t structure */
-static unsigned long xbt_self_thread_key;
-
-void xbt_os_thread_mod_preinit(void)
-{
- xbt_self_thread_key = TlsAlloc();
-}
-
-void xbt_os_thread_mod_postexit(void)
-{
-
- if (!TlsFree(xbt_self_thread_key))
- THROWF(system_error, (int) GetLastError(),
- "TlsFree() failed to cleanup the thread submodule");
-}
-
-int xbt_os_thread_atfork(void (*prepare)(void),
- void (*parent)(void), void (*child)(void))
-{
- return 0;
-}
-
-static DWORD WINAPI wrapper_start_routine(void *s)
-{
- xbt_os_thread_t t = (xbt_os_thread_t) s;
- DWORD *rv;
-
- if (!TlsSetValue(xbt_self_thread_key, t))
- THROWF(system_error, (int) GetLastError(),
- "TlsSetValue of data describing the created thread failed");
-
- rv = (DWORD *) ((t->start_routine) (t->param));
-
- return rv ? *rv : 0;
-
-}
-
-
-xbt_os_thread_t xbt_os_thread_create(const char *name,
- pvoid_f_pvoid_t start_routine,
- void *param,
- void *extra_data)
-{
-
- xbt_os_thread_t t = xbt_new(s_xbt_os_thread_t, 1);
-
- t->name = xbt_strdup(name);
- t->start_routine = start_routine;
- t->param = param;
- t->extra_data = extra_data;
- t->handle = CreateThread(NULL, stack_size==0 ? XBT_DEFAULT_THREAD_STACK_SIZE : stack_size,
- (LPTHREAD_START_ROUTINE) wrapper_start_routine,
- t, STACK_SIZE_PARAM_IS_A_RESERVATION, &(t->id));
-
- if (!t->handle) {
- xbt_free(t);
- THROWF(system_error, (int) GetLastError(), "CreateThread failed");
- }
-
- return t;
-}
-
-void xbt_os_thread_setstacksize(int size)
-{
- stack_size = size;
-}
-
-const char *xbt_os_thread_name(xbt_os_thread_t t)
-{
- return t->name;
-}
-
-const char *xbt_os_thread_self_name(void)
-{
- xbt_os_thread_t t = xbt_os_thread_self();
- return t ? t->name : "main";
-}
-
-void xbt_os_thread_join(xbt_os_thread_t thread, void **thread_return)
-{
-
- if (WAIT_OBJECT_0 != WaitForSingleObject(thread->handle, INFINITE))
- THROWF(system_error, (int) GetLastError(),
- "WaitForSingleObject failed");
-
- if (thread_return) {
-
- if (!GetExitCodeThread(thread->handle, (DWORD *) (*thread_return)))
- THROWF(system_error, (int) GetLastError(),
- "GetExitCodeThread failed");
- }
-
- CloseHandle(thread->handle);
-
- free(thread->name);
-
- free(thread);
-}
-
-void xbt_os_thread_exit(int *retval)
-{
- if (retval)
- ExitThread(*retval);
- else
- ExitThread(0);
-}
-
-void xbt_os_thread_key_create(xbt_os_thread_key_t* key) {
-
- *key = TlsAlloc();
-}
-
-void xbt_os_thread_set_specific(xbt_os_thread_key_t key, void* value) {
-
- if (!TlsSetValue(key, value))
- THROWF(system_error, (int) GetLastError(), "TlsSetValue() failed");
-}
-
-void* xbt_os_thread_get_specific(xbt_os_thread_key_t key) {
- return TlsGetValue(key);
-}
-
-void xbt_os_thread_detach(xbt_os_thread_t thread)
-{
- THROW_UNIMPLEMENTED;
-}
-
-
-xbt_os_thread_t xbt_os_thread_self(void)
-{
- return TlsGetValue(xbt_self_thread_key);
-}
-
-void *xbt_os_thread_getparam(void)
-{
- xbt_os_thread_t t = xbt_os_thread_self();
- return t->param;
-}
-
-
-void xbt_os_thread_yield(void)
-{
- Sleep(0);
-}
-
-void xbt_os_thread_cancel(xbt_os_thread_t t)
-{
- if (!TerminateThread(t->handle, 0))
- THROWF(system_error, (int) GetLastError(), "TerminateThread failed");
-}
-
-/****** mutex related functions ******/
-typedef struct xbt_os_mutex_ {
- /* KEEP IT IN SYNC WITH xbt_thread.c */
- CRITICAL_SECTION lock;
-} s_xbt_os_mutex_t;
-
-xbt_os_mutex_t xbt_os_mutex_init(void)
-{
- xbt_os_mutex_t res = xbt_new(s_xbt_os_mutex_t, 1);
-
- /* initialize the critical section object */
- InitializeCriticalSection(&(res->lock));
-
- return res;
-}
-
-void xbt_os_mutex_acquire(xbt_os_mutex_t mutex)
-{
- EnterCriticalSection(&mutex->lock);
-}
-
-void xbt_os_mutex_timedacquire(xbt_os_mutex_t mutex, double delay)
-{
- THROW_UNIMPLEMENTED;
-}
-
-void xbt_os_mutex_release(xbt_os_mutex_t mutex)
-{
-
- LeaveCriticalSection(&mutex->lock);
-
-}
-
-void xbt_os_mutex_destroy(xbt_os_mutex_t mutex)
-{
-
- if (!mutex)
- return;
-
- DeleteCriticalSection(&mutex->lock);
- free(mutex);
-}
-
-/***** condition related functions *****/
-enum { /* KEEP IT IN SYNC WITH xbt_thread.c */
- SIGNAL = 0,
- BROADCAST = 1,
- MAX_EVENTS = 2
-};
-
-typedef struct xbt_os_cond_ {
- /* KEEP IT IN SYNC WITH xbt_thread.c */
- HANDLE events[MAX_EVENTS];
-
- unsigned int waiters_count; /* the number of waiters */
- CRITICAL_SECTION waiters_count_lock; /* protect access to waiters_count */
-} s_xbt_os_cond_t;
-
-xbt_os_cond_t xbt_os_cond_init(void)
-{
-
- xbt_os_cond_t res = xbt_new0(s_xbt_os_cond_t, 1);
-
- memset(&res->waiters_count_lock, 0, sizeof(CRITICAL_SECTION));
-
- /* initialize the critical section object */
- InitializeCriticalSection(&res->waiters_count_lock);
-
- res->waiters_count = 0;
-
- /* Create an auto-reset event */
- res->events[SIGNAL] = CreateEvent(NULL, FALSE, FALSE, NULL);
-
- if (!res->events[SIGNAL]) {
- DeleteCriticalSection(&res->waiters_count_lock);
- free(res);
- THROWF(system_error, 0, "CreateEvent failed for the signals");
- }
-
- /* Create a manual-reset event. */
- res->events[BROADCAST] = CreateEvent(NULL, TRUE, FALSE, NULL);
-
- if (!res->events[BROADCAST]) {
-
- DeleteCriticalSection(&res->waiters_count_lock);
- CloseHandle(res->events[SIGNAL]);
- free(res);
- THROWF(system_error, 0, "CreateEvent failed for the broadcasts");
- }
-
- return res;
-}
-
-void xbt_os_cond_wait(xbt_os_cond_t cond, xbt_os_mutex_t mutex)
-{
-
- unsigned long wait_result;
- int is_last_waiter;
-
- /* lock the threads counter and increment it */
- EnterCriticalSection(&cond->waiters_count_lock);
- cond->waiters_count++;
- LeaveCriticalSection(&cond->waiters_count_lock);
-
- /* unlock the mutex associate with the condition */
- LeaveCriticalSection(&mutex->lock);
-
- /* wait for a signal (broadcast or no) */
- wait_result = WaitForMultipleObjects(2, cond->events, FALSE, INFINITE);
-
- if (wait_result == WAIT_FAILED)
- THROWF(system_error, 0,
- "WaitForMultipleObjects failed, so we cannot wait on the condition");
-
- /* we have a signal lock the condition */
- EnterCriticalSection(&cond->waiters_count_lock);
- cond->waiters_count--;
-
- /* it's the last waiter or it's a broadcast ? */
- is_last_waiter = ((wait_result == WAIT_OBJECT_0 + BROADCAST - 1)
- && (cond->waiters_count == 0));
-
- LeaveCriticalSection(&cond->waiters_count_lock);
-
- /* yes it's the last waiter or it's a broadcast
- * only reset the manual event (the automatic event is reset in the WaitForMultipleObjects() function
- * by the system.
- */
- if (is_last_waiter)
- if (!ResetEvent(cond->events[BROADCAST]))
- THROWF(system_error, 0, "ResetEvent failed");
-
- /* relock the mutex associated with the condition in accordance with the posix thread specification */
- EnterCriticalSection(&mutex->lock);
-}
-
-void xbt_os_cond_timedwait(xbt_os_cond_t cond, xbt_os_mutex_t mutex,
- double delay)
-{
-
- unsigned long wait_result = WAIT_TIMEOUT;
- int is_last_waiter;
- unsigned long end = (unsigned long) (delay * 1000);
-
-
- if (delay < 0) {
- xbt_os_cond_wait(cond, mutex);
- } else {
- XBT_DEBUG("xbt_cond_timedwait(%p,%p,%lu)", &(cond->events),
- &(mutex->lock), end);
-
- /* lock the threads counter and increment it */
- EnterCriticalSection(&cond->waiters_count_lock);
- cond->waiters_count++;
- LeaveCriticalSection(&cond->waiters_count_lock);
-
- /* unlock the mutex associate with the condition */
- LeaveCriticalSection(&mutex->lock);
- /* wait for a signal (broadcast or no) */
-
- wait_result = WaitForMultipleObjects(2, cond->events, FALSE, end);
-
- switch (wait_result) {
- case WAIT_TIMEOUT:
- THROWF(timeout_error, GetLastError(),
- "condition %p (mutex %p) wasn't signaled before timeout (%f)",
- cond, mutex, delay);
- case WAIT_FAILED:
- THROWF(system_error, GetLastError(),
- "WaitForMultipleObjects failed, so we cannot wait on the condition");
- }
-
- /* we have a signal lock the condition */
- EnterCriticalSection(&cond->waiters_count_lock);
- cond->waiters_count--;
-
- /* it's the last waiter or it's a broadcast ? */
- is_last_waiter = ((wait_result == WAIT_OBJECT_0 + BROADCAST - 1)
- && (cond->waiters_count == 0));
-
- LeaveCriticalSection(&cond->waiters_count_lock);
-
- /* yes it's the last waiter or it's a broadcast
- * only reset the manual event (the automatic event is reset in the WaitForMultipleObjects() function
- * by the system.
- */
- if (is_last_waiter)
- if (!ResetEvent(cond->events[BROADCAST]))
- THROWF(system_error, 0, "ResetEvent failed");
-
- /* relock the mutex associated with the condition in accordance with the posix thread specification */
- EnterCriticalSection(&mutex->lock);
- }
- /*THROW_UNIMPLEMENTED; */
-}
-
-void xbt_os_cond_signal(xbt_os_cond_t cond)
-{
- int have_waiters;
-
- EnterCriticalSection(&cond->waiters_count_lock);
- have_waiters = cond->waiters_count > 0;
- LeaveCriticalSection(&cond->waiters_count_lock);
-
- if (have_waiters)
- if (!SetEvent(cond->events[SIGNAL]))
- THROWF(system_error, 0, "SetEvent failed");
-
- xbt_os_thread_yield();
-}
-
-void xbt_os_cond_broadcast(xbt_os_cond_t cond)
-{
- int have_waiters;
-
- EnterCriticalSection(&cond->waiters_count_lock);
- have_waiters = cond->waiters_count > 0;
- LeaveCriticalSection(&cond->waiters_count_lock);
-
- if (have_waiters)
- SetEvent(cond->events[BROADCAST]);
-}
-
-void xbt_os_cond_destroy(xbt_os_cond_t cond)
-{
- int error = 0;
-
- if (!cond)
- return;
-
- if (!CloseHandle(cond->events[SIGNAL]))
- error = 1;
-
- if (!CloseHandle(cond->events[BROADCAST]))
- error = 1;
-
- DeleteCriticalSection(&cond->waiters_count_lock);
-
- xbt_free(cond);
-
- if (error)
- THROWF(system_error, 0, "Error while destroying the condition");
-}
-
-typedef struct xbt_os_sem_ {
- HANDLE h;
- unsigned int value;
- CRITICAL_SECTION value_lock; /* protect access to value of the semaphore */
-} s_xbt_os_sem_t;
-
-#ifndef INT_MAX
-# define INT_MAX 32767 /* let's be safe by underestimating this value: this is for 16bits only */
#endif
-
-xbt_os_sem_t xbt_os_sem_init(unsigned int value)
-{
- xbt_os_sem_t res;
-
- if (value > INT_MAX)
- THROWF(arg_error, value,
- "Semaphore initial value too big: %ud cannot be stored as a signed int",
- value);
-
- res = (xbt_os_sem_t) xbt_new0(s_xbt_os_sem_t, 1);
-
- if (!(res->h = CreateSemaphore(NULL, value, (long) INT_MAX, NULL))) {
- THROWF(system_error, GetLastError(), "CreateSemaphore() failed: %s",
- strerror(GetLastError()));
- return NULL;
- }
-
- res->value = value;
-
- InitializeCriticalSection(&(res->value_lock));
-
- return res;
-}
-
-void xbt_os_sem_acquire(xbt_os_sem_t sem)
-{
- if (!sem)
- THROWF(arg_error, EINVAL, "Cannot acquire the NULL semaphore");
-
- /* wait failure */
- if (WAIT_OBJECT_0 != WaitForSingleObject(sem->h, INFINITE))
- THROWF(system_error, GetLastError(),
- "WaitForSingleObject() failed: %s", strerror(GetLastError()));
- EnterCriticalSection(&(sem->value_lock));
- sem->value--;
- LeaveCriticalSection(&(sem->value_lock));
-}
-
-void xbt_os_sem_timedacquire(xbt_os_sem_t sem, double timeout)
-{
- long seconds;
- long milliseconds;
- double end = timeout + xbt_os_time();
-
- if (!sem)
- THROWF(arg_error, EINVAL, "Cannot acquire the NULL semaphore");
-
- if (timeout < 0) {
- xbt_os_sem_acquire(sem);
- } else { /* timeout can be zero <-> try acquire ) */
-
-
- seconds = (long) floor(end);
- milliseconds = (long) ((end - seconds) * 1000);
- milliseconds += (seconds * 1000);
-
- switch (WaitForSingleObject(sem->h, milliseconds)) {
- case WAIT_OBJECT_0:
- EnterCriticalSection(&(sem->value_lock));
- sem->value--;
- LeaveCriticalSection(&(sem->value_lock));
- return;
-
- case WAIT_TIMEOUT:
- THROWF(timeout_error, GetLastError(),
- "semaphore %p wasn't signaled before timeout (%f)", sem,
- timeout);
- return;
-
- default:
- THROWF(system_error, GetLastError(),
- "WaitForSingleObject(%p,%f) failed: %s", sem, timeout,
- strerror(GetLastError()));
- }
- }
-}
-
-void xbt_os_sem_release(xbt_os_sem_t sem)
-{
- if (!sem)
- THROWF(arg_error, EINVAL, "Cannot release the NULL semaphore");
-
- if (!ReleaseSemaphore(sem->h, 1, NULL))
- THROWF(system_error, GetLastError(), "ReleaseSemaphore() failed: %s",
- strerror(GetLastError()));
- EnterCriticalSection(&(sem->value_lock));
- sem->value++;
- LeaveCriticalSection(&(sem->value_lock));
-}
-
-void xbt_os_sem_destroy(xbt_os_sem_t sem)
-{
- if (!sem)
- THROWF(arg_error, EINVAL, "Cannot destroy the NULL semaphore");
-
- if (!CloseHandle(sem->h))
- THROWF(system_error, GetLastError(), "CloseHandle() failed: %s",
- strerror(GetLastError()));
-
- DeleteCriticalSection(&(sem->value_lock));
-
xbt_free(sem);
-
-}
-
-void xbt_os_sem_get_value(xbt_os_sem_t sem, int *svalue)
-{
- if (!sem)
- THROWF(arg_error, EINVAL,
- "Cannot get the value of the NULL semaphore");
-
- EnterCriticalSection(&(sem->value_lock));
- *svalue = sem->value;
- LeaveCriticalSection(&(sem->value_lock));
}
-
-#endif
-
-
/** @brief Returns the amount of cores on the current host */
int xbt_os_get_numcores(void) {
#ifdef WIN32
SYSTEM_INFO sysinfo;
GetSystemInfo(&sysinfo);
return sysinfo.dwNumberOfProcessors;
-#elif MACOS
+#elif defined(__APPLE__) && defined(__MACH__)
int nm[2];
size_t len = 4;
uint32_t count;
#endif
}
-
-/***** reentrant mutexes *****/
-typedef struct xbt_os_rmutex_ {
- xbt_os_mutex_t mutex;
- xbt_os_thread_t owner;
- int count;
-} s_xbt_os_rmutex_t;
-
void xbt_os_thread_set_extra_data(void *data)
{
xbt_os_thread_self()->extra_data = data;
void *xbt_os_thread_get_extra_data(void)
{
- return xbt_os_thread_self()->extra_data;
-}
-
-xbt_os_rmutex_t xbt_os_rmutex_init(void)
-{
- xbt_os_rmutex_t rmutex = xbt_new0(struct xbt_os_rmutex_, 1);
- rmutex->mutex = xbt_os_mutex_init();
- rmutex->owner = NULL;
- rmutex->count = 0;
- return rmutex;
-}
-
-void xbt_os_rmutex_acquire(xbt_os_rmutex_t rmutex)
-{
- xbt_os_thread_t self = xbt_os_thread_self();
-
- if (self == NULL) {
- /* the thread module is not initialized yet */
- rmutex->owner = NULL;
- return;
- }
-
- if (self != rmutex->owner) {
- xbt_os_mutex_acquire(rmutex->mutex);
- rmutex->owner = self;
- rmutex->count = 1;
- } else {
- rmutex->count++;
- }
-}
-
-void xbt_os_rmutex_release(xbt_os_rmutex_t rmutex)
-{
- if (rmutex->owner == NULL) {
- /* the thread module was not initialized */
- return;
- }
-
- xbt_assert(rmutex->owner == xbt_os_thread_self());
-
- if (--rmutex->count == 0) {
- rmutex->owner = NULL;
- xbt_os_mutex_release(rmutex->mutex);
- }
-}
-
-void xbt_os_rmutex_destroy(xbt_os_rmutex_t rmutex)
-{
- xbt_os_mutex_destroy(rmutex->mutex);
- xbt_free(rmutex);
+ xbt_os_thread_t thread = xbt_os_thread_self();
+ return thread ? thread->extra_data : NULL;
}
